Survival knives are intended for survival purposes when lost in a wilderness environment. Military units frequently issue some type of survival knife. Hunters, hikers, and other outdoor sport enthusiasts also purchase and use great numbers of commercial survival knives. Some survival knives are heavy-bladed and thick; others are more lightweight or fold in order to save weight and bulk as part of a larger survival kit.
During WWII, survival knives were issued to aircraft crew, as it was a real possibility that these personnel might be shot down over wilderness or behind enemy lines. Lifeboats aboard naval vessels also frequently contained survival kits including knives. These knives varied in design from one branch of the service to another and from one nation to another. The majority of them were simply commercial knives purchased in bulk by the military. From the Vietnam-era and to present, purpose-built survival knives evolved. The serrations often seen on more recent survival knives are intended to allow aircrewmen to cut their way free through the relatively thin metal skin of a crashed helicopter or airplane. They do not function well as woodsaws nor are they intended as such. Those knives that do include functional saw-teeth still suffer from lack of blade length limiting the thickness of what can be cut when used as a saw. Other features, such as hollow handles that could be used as storage space for matches or similar small items, began gaining popularity in the 1980s. Custom or semi-custom makers such as Jimmy Lile and Bo Randall are often credited with inventing those features, but all of them can be found individually in earlier commercial knives. The movie Rambo may legitimately be credited with having created the market demand for large, serrated, hollow-handled survival knives. Knives of that description are even sometimes referred to as Rambo knives.
Some militaries, including the US, have redesigned the bayonet used with their issued rifle to include survival knife features. Historically, bayonets had functioned poorly as field knives, due to being designed primarily to turn a rifle into a thrusting weapon and only secondarily (if at all) to work as a field knife. The newer models function more acceptably for mundane tasks while retaining the capability to be attached to the muzzle of the rifle.
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